ABAP Select data from SAP table J_1BTXDATA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_1BTXDATA table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to J_1BTXDATA. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the J_1BTXDATA table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_J_1BTXDATA TYPE STANDARD TABLE OF J_1BTXDATA,
      WA_J_1BTXDATA TYPE J_1BTXDATA,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <J_1BTXDATA> TYPE J_1BTXDATA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_1BTXDATA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_1BTXDATA
  INTO TABLE IT_J_1BTXDATA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_1BTXDATA
*  INTO TABLE @DATA(IT_J_1BTXDATA2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_J_1BTXDATA INDEX 1 INTO DATA(WA_J_1BTXDATA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_1BTXDATA ASSIGNING <J_1BTXDATA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_1BTXDATA>-KNUMV = 1.
<J_1BTXDATA>-KPOSN = 1.
<J_1BTXDATA>-BUZEI = 1.
<J_1BTXDATA>-TAXTYP = 1.
<J_1BTXDATA>-BASE = 1.

ENDLOOP.

LOOP AT IT_J_1BTXDATA INTO WA_J_1BTXDATA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_1BTXDATA-RATE, sy-vline,
  WA_J_1BTXDATA-TAXVAL, sy-vline,
  WA_J_1BTXDATA-EXCBAS, sy-vline,
  WA_J_1BTXDATA-OTHBAS, sy-vline,
  WA_J_1BTXDATA-FACTOR, sy-vline,
  WA_J_1BTXDATA-UNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_1BTXDATA you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_J_1BTXDATA TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_J_1BTXDATA INTO WA_J_1BTXDATA.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_1BTXDATA-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_1BTXDATA-UNIT.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_J_1BTXDATA_STR, 
KNUMV TYPE STRING,
KPOSN TYPE STRING,
BUZEI TYPE STRING,
TAXTYP TYPE STRING,
BASE TYPE STRING,
RATE TYPE STRING,
TAXVAL TYPE STRING,
EXCBAS TYPE STRING,
OTHBAS TYPE STRING,
FACTOR TYPE STRING,
UNIT TYPE STRING,
RECTYPE TYPE STRING,
TAXCHANGE TYPE STRING,
FOREIGNCUR TYPE STRING,
DEDUCTIBLE TYPE STRING,
TAX_LOC TYPE STRING,
SERVTYPE_IN TYPE STRING,
SERVTYPE_OUT TYPE STRING,
WITHHOLD TYPE STRING,
TAXINNET TYPE STRING,
WHTCOLLCODE TYPE STRING,
TXBASE TYPE STRING,
BASERED1 TYPE STRING,
BASERED2 TYPE STRING,
RATE4DEC TYPE STRING,
FACTOR4DEC TYPE STRING,
TAX_DIFFERENCE TYPE STRING,
SRATE TYPE STRING,
PAUTA_BASE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_1BTXDATA_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_J_1BTXDATA_STR-KNUMV sy-vline 
WA_J_1BTXDATA_STR-KPOSN sy-vline 
WA_J_1BTXDATA_STR-BUZEI sy-vline 
WA_J_1BTXDATA_STR-TAXTYP sy-vline 
WA_J_1BTXDATA_STR-BASE sy-vline 
WA_J_1BTXDATA_STR-RATE sy-vline 
WA_J_1BTXDATA_STR-TAXVAL sy-vline 
WA_J_1BTXDATA_STR-EXCBAS sy-vline 
WA_J_1BTXDATA_STR-OTHBAS sy-vline 
WA_J_1BTXDATA_STR-FACTOR sy-vline 
WA_J_1BTXDATA_STR-UNIT sy-vline 
WA_J_1BTXDATA_STR-RECTYPE sy-vline 
WA_J_1BTXDATA_STR-TAXCHANGE sy-vline 
WA_J_1BTXDATA_STR-FOREIGNCUR sy-vline 
WA_J_1BTXDATA_STR-DEDUCTIBLE sy-vline 
WA_J_1BTXDATA_STR-TAX_LOC sy-vline 
WA_J_1BTXDATA_STR-SERVTYPE_IN sy-vline 
WA_J_1BTXDATA_STR-SERVTYPE_OUT sy-vline 
WA_J_1BTXDATA_STR-WITHHOLD sy-vline 
WA_J_1BTXDATA_STR-TAXINNET sy-vline 
WA_J_1BTXDATA_STR-WHTCOLLCODE sy-vline 
WA_J_1BTXDATA_STR-TXBASE sy-vline 
WA_J_1BTXDATA_STR-BASERED1 sy-vline 
WA_J_1BTXDATA_STR-BASERED2 sy-vline 
WA_J_1BTXDATA_STR-RATE4DEC sy-vline 
WA_J_1BTXDATA_STR-FACTOR4DEC sy-vline 
WA_J_1BTXDATA_STR-TAX_DIFFERENCE sy-vline 
WA_J_1BTXDATA_STR-SRATE sy-vline 
WA_J_1BTXDATA_STR-PAUTA_BASE sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.